I'm just in the middle of launching an LTE-M based device that contains a primary power source (a 12v vehicle battery) with a supercap for backup power when the

I'm just in the middle of launching an LTE-M based device that contains a primary power source (a 12v vehicle battery) with a supercap for backup power when the battery dies. Average power at the moment is around ~3mA to keep an LTE-M module (using a QCOM chipset) connected to the network in DRX mode. Bandwidth wise, LTE-M gives us between 500bytes and 3.5KBs per second on the AT&T network - its not terrible and the byte cost is also "low" from AT&T. LTE-M network coverage is good - same as AT&T LTE as far as we can tell (as LTE-M is just an extension to the basestation feature set and doesn't need new infrastructure). Only when AT&T starts to support eDRX and PSM will "a month long" battery be realizable for portable products like this.